The massive use of deep foundations had a remarkable influence in the building industry in the 20th century.Piles and micropiles made possible to erect thousands of civil structures around the world, changingquintessentially the urban and rural landscapes.Especially in urban areas, the ongoing development requires not only new infrastructure, but also to increasethe capacity and/or to extend the serviceability of existing structures (buildings, bridges, etc.).Factors such as the change of use of existing facilities or the requirement to comply with updated buildingregulations confront Civil Engineers with the question, whether to tear down and build new structures, or toreinforce the existing structures from their foundations.Micropiling has enabled designers to come up with technical feasible solutions to retrofit the existing deepfoundations, making the structural reinforcement a real option, even under considerable changes in theloading conditions.The following article presents an overview of an intervention project, where micropiles were designed toreinforce the original pile foundation of an existing building, enabling it to be reused with a differentstructural function.This paper will focus mainly on the analysis of the interaction between the existing piles and the reinforcingmicropiles, especially in terms of settlements’ compatibility. Finally, the adopted solution, with itscorrespondent design considerations and execution process will be presented.
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